PHP User Defined Functions

What is User Defined Functions?


User Defined Function:

Functions that are written by the user are User defined functions.


function function name [(argument1, argument 2, ...argument n)] {
any PHP code }

The syntax of a user defined function has a unique function name,the user can pass any number of arguments seperated by comma, the user can include any PHP code and even another function.

Example :

function hello()

Using the function hello() anywhere in the PHP code will display the word "Hello".Usually functions and classes have global scope,and functions cannot be un-defined or re-defined.

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